/* -*- Mode: C; c-basic-offset:4 ; indent-tabs-mode:nil ; -*- */
/*
 *
 *  (C) 2001 by Argonne National Laboratory.
 *      See COPYRIGHT in top-level directory.
 */

#include "mpiimpl.h"


/* -- Begin Profiling Symbol Block for routine MPI_Request_get_status */
#if defined(HAVE_PRAGMA_WEAK)
#pragma weak MPI_Request_get_status = PMPI_Request_get_status
#elif defined(HAVE_PRAGMA_HP_SEC_DEF)
#pragma _HP_SECONDARY_DEF PMPI_Request_get_status  MPI_Request_get_status
#elif defined(HAVE_PRAGMA_CRI_DUP)
#pragma _CRI duplicate MPI_Request_get_status as PMPI_Request_get_status
#elif defined(HAVE_WEAK_ATTRIBUTE)
int MPI_Request_get_status(MPI_Request request, int *flag, MPI_Status *status) __attribute__((weak,alias("PMPI_Request_get_status")));
#endif
/* -- End Profiling Symbol Block */

/* Define MPICH_MPI_FROM_PMPI if weak symbols are not supported to build
   the MPI routines */
#ifndef MPICH_MPI_FROM_PMPI
#undef MPI_Request_get_status
#define MPI_Request_get_status PMPI_Request_get_status

#endif

#undef FUNCNAME
#define FUNCNAME MPI_Request_get_status

/*@
   MPI_Request_get_status - Nondestructive test for the completion of a Request

Input Parameters:
.  request - request (handle).  May be 'MPI_REQUEST_NULL'.

Output Parameters:
+  flag - true if operation has completed (logical)
-  status - status object (Status).  May be 'MPI_STATUS_IGNORE'.

   Notes:
   Unlike 'MPI_Test', 'MPI_Request_get_status' does not deallocate or
   deactivate the request.  A call to one of the test/wait routines or 
   'MPI_Request_free' should be made to release the request object.

.N ThreadSafe

.N Fortran

.N Errors
.N MPI_SUCCESS
@*/
int MPI_Request_get_status(MPI_Request request, int *flag, MPI_Status *status)
{
    static const char FCNAME[] = "MPI_Request_get_status";
    int mpi_errno = MPI_SUCCESS;
    MPIR_Request *request_ptr = NULL;
    MPIR_FUNC_TERSE_STATE_DECL(MPID_STATE_MPI_REQUEST_GET_STATUS);

    MPIR_ERRTEST_INITIALIZED_ORDIE();

    MPID_THREAD_CS_ENTER(GLOBAL, MPIR_THREAD_GLOBAL_ALLFUNC_MUTEX);
    MPIR_FUNC_TERSE_ENTER(MPID_STATE_MPI_REQUEST_GET_STATUS);

    /* Check the arguments */
#   ifdef HAVE_ERROR_CHECKING
    {
        MPID_BEGIN_ERROR_CHECKS;
        {
	    MPIR_ERRTEST_REQUEST_OR_NULL(request, mpi_errno);
	    MPIR_ERRTEST_ARGNULL(flag, "flag", mpi_errno);
	    /* NOTE: MPI_STATUS_IGNORE != NULL */
	    MPIR_ERRTEST_ARGNULL(status, "status", mpi_errno);
	}
        MPID_END_ERROR_CHECKS;
    }
#   endif /* HAVE_ERROR_CHECKING */

    /* If this is a null request handle, then return an empty status */
    if (request == MPI_REQUEST_NULL) {
        *flag = 1;
        MPIR_Status_set_empty(status);
        /* the above macro doesn't set MPI_ERROR */
        if (status != MPI_STATUS_IGNORE)
            status->MPI_ERROR = MPI_SUCCESS;
        goto fn_exit;
    }

    /* Convert MPI object handles to object pointers */
    MPIR_Request_get_ptr( request, request_ptr );

    /* Validate parameters if error checking is enabled */
#   ifdef HAVE_ERROR_CHECKING
    {
        MPID_BEGIN_ERROR_CHECKS;
        {
	    /* Validate request_ptr */
            MPIR_Request_valid_ptr( request_ptr, mpi_errno );
            if (mpi_errno) goto fn_fail;
        }
        MPID_END_ERROR_CHECKS;
    }
#   endif /* HAVE_ERROR_CHECKING */

    /* ... body of routine ...  */

    if (!MPIR_Request_is_complete(request_ptr)) {
	/* request not complete. poke the progress engine. Req #3130 */
	mpi_errno = MPID_Progress_test();
	if (mpi_errno != MPI_SUCCESS) goto fn_fail;
    }
    
    if (MPIR_Request_is_complete(request_ptr))
    {
	switch(request_ptr->kind)
	{
        case MPIR_REQUEST_KIND__SEND:
        {
            if (status != MPI_STATUS_IGNORE)
            {
                MPIR_STATUS_SET_CANCEL_BIT(*status, MPIR_STATUS_GET_CANCEL_BIT(request_ptr->status));
            }
            mpi_errno = request_ptr->status.MPI_ERROR;
            break;
        }
        
        case MPIR_REQUEST_KIND__RECV:
        {
            MPIR_Request_extract_status(request_ptr, status);
            mpi_errno = request_ptr->status.MPI_ERROR;
            break;
        }
        
        case MPIR_REQUEST_KIND__PREQUEST_SEND:
        {
            MPIR_Request * prequest_ptr = request_ptr->u.persist.real_request;
            
            if (prequest_ptr != NULL)
            {
		if (prequest_ptr->kind != MPIR_REQUEST_KIND__GREQUEST)
		{
		    if (status != MPI_STATUS_IGNORE)
		    {
			MPIR_STATUS_SET_CANCEL_BIT(*status, MPIR_STATUS_GET_CANCEL_BIT(request_ptr->status));
		    }
		    mpi_errno = prequest_ptr->status.MPI_ERROR;
		}
		else
		{
		    /* This is needed for persistent Bsend requests */
                    int rc;
                    
                    rc = MPIR_Grequest_query(prequest_ptr);
                    if (mpi_errno == MPI_SUCCESS)
                    {
                        mpi_errno = rc;
                    }
                    if (status != MPI_STATUS_IGNORE)
                    {
                        MPIR_STATUS_SET_CANCEL_BIT(*status, MPIR_STATUS_GET_CANCEL_BIT(prequest_ptr->status));
                    }
                    if (mpi_errno == MPI_SUCCESS)
                    {
                        mpi_errno = prequest_ptr->status.MPI_ERROR;
                    }
		}
            }
            else
            {
                if (request_ptr->status.MPI_ERROR != MPI_SUCCESS)
                {
                    /* if the persistent request failed to start then 
                       make the error code available */
                    if (status != MPI_STATUS_IGNORE)
                    {
                        MPIR_STATUS_SET_CANCEL_BIT(*status, MPIR_STATUS_GET_CANCEL_BIT(request_ptr->status));
                    }
                    mpi_errno = request_ptr->status.MPI_ERROR;
                }
                else
                {
                    MPIR_Status_set_empty(status);
                }
            }
	    
            break;
        }
        
        case MPIR_REQUEST_KIND__PREQUEST_RECV:
        {
            MPIR_Request * prequest_ptr = request_ptr->u.persist.real_request;
            
            if (prequest_ptr != NULL)
            {
                MPIR_Request_extract_status(prequest_ptr, status);
                mpi_errno = prequest_ptr->status.MPI_ERROR;
            }
            else
            {
                /* if the persistent request failed to start then
                   make the error code available */
                mpi_errno = request_ptr->status.MPI_ERROR;
                MPIR_Status_set_empty(status);
            }
	    
            break;
        }

        case MPIR_REQUEST_KIND__GREQUEST:
        {
            int rc;
            
            rc = MPIR_Grequest_query(request_ptr);
            if (mpi_errno == MPI_SUCCESS)
            {
                mpi_errno = rc;
            }
            if (status != MPI_STATUS_IGNORE)
            {
                MPIR_STATUS_SET_CANCEL_BIT(*status, MPIR_STATUS_GET_CANCEL_BIT(request_ptr->status));
            }
            MPIR_Request_extract_status(request_ptr, status);
	    
            break;
        }
        
        default:
            break;
	}

	*flag = TRUE;
    }
    else
    {
	*flag = FALSE;
    }

    /* --BEGIN ERROR HANDLING-- */
    if (mpi_errno != MPI_SUCCESS) goto fn_fail;
    /* --END ERROR HANDLING-- */

    /* ... end of body of routine ... */
    
  fn_exit:
    MPIR_FUNC_TERSE_EXIT(MPID_STATE_MPI_REQUEST_GET_STATUS);
    MPID_THREAD_CS_EXIT(GLOBAL, MPIR_THREAD_GLOBAL_ALLFUNC_MUTEX);
    return mpi_errno;

  fn_fail:
    /* --BEGIN ERROR HANDLING-- */
#   ifdef HAVE_ERROR_CHECKING
    {
	mpi_errno = MPIR_Err_create_code(mpi_errno, MPIR_ERR_RECOVERABLE,
	    FCNAME, __LINE__, MPI_ERR_OTHER, "**mpi_request_get_status",
	    "**mpi_request_get_status %R %p %p", request, flag, status);
    }
#   endif
    mpi_errno = MPIR_Err_return_comm( 0, FCNAME, mpi_errno );
    goto fn_exit;
    /* --END ERROR HANDLING-- */
}
